US6155795A - Ejector - Google Patents

Ejector Download PDF

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Publication number
US6155795A
US6155795A US09/270,672 US27067299A US6155795A US 6155795 A US6155795 A US 6155795A US 27067299 A US27067299 A US 27067299A US 6155795 A US6155795 A US 6155795A
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US
United States
Prior art keywords
conduit
ejector
housing
propellant
suction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09/270,672
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English (en)
Inventor
Kurt Schmalz
Ralf Stockburger
Thomas Eisele
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
J Schmalz GmbH
Original Assignee
J Schmalz GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by J Schmalz GmbH filed Critical J Schmalz GmbH
Assigned to J. SCHMALZ GMBH reassignment J. SCHMALZ GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EISELE, THOMAS, STOCKBURGER, RALF, SCHMALZ, KURT
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Publication of US6155795A publication Critical patent/US6155795A/en
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/54—Installations characterised by use of jet pumps, e.g. combinations of two or more jet pumps of different type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B65H3/0883—Construction of suction grippers or their holding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/08—Feeding articles separated from piles; Feeding articles to machines by grippers, e.g. suction grippers
    • B65H5/14—Details of grippers; Actuating-mechanisms therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/02—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by suction means
    • B66C1/0212—Circular shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/02—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by suction means
    • B66C1/0237—Multiple lifting units; More than one suction area
    • B66C1/0243—Separate cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/02—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by suction means
    • B66C1/0256—Operating and control devices
    • B66C1/0268—Venturi effect

Definitions

  • the present invention relates to an ejector for generating a vacuum, with a housing, with a propellant nozzle having a narrowed part, a diffuser section, a suction connector terminating in the narrowed part, as well as an exhaust air conduit for the pressure gas and the exhausted air.
  • Such ejectors are known, for example, from German Patent DE 43 02 951 C1, and operate in accordance with the Venturi principle.
  • the pressure gas, compressed air as a rule which is filtered and free of lubricant, flows through a connector into the ejector and reaches the propellant nozzle, in which the flow speed of the air is increased to supersonic speed in the narrowed part.
  • the air is expanded and flows into the diffuser, and from there into the open, possibly via a muffler.
  • a vacuum is created in the chamber surrounding the propellant nozzle, which results in air being aspirated via the suction connector.
  • the aspirated air and the propellant introduced into the jet pump move into the open together via an expansion section.
  • the present invention has as an object making available an ejector of the type mentioned at the outset, which has a simpler construction.
  • the housing of the ejector is designed as a support, in particular as a sectional support for at least two propellant nozzles.
  • the housing of the ejector as a section support
  • the essential advantage is achieved that for one, the housing can be produced relatively inexpensively, and for another the sectional support can be equipped with any arbitrary number of propellant nozzles.
  • the sectional support of the present invention is equipped with five propellant nozzles, so that this sectional support now constitutes the desired unit.
  • the sectional support in particular is an extruded section, which can be cut to size to the desired length.
  • This extruded section can have the receivers for the propellant nozzles arranged in a grid pattern. However, the receivers can also be cut in at the desired locations in the form of bores, so that the unit is designed in accordance with the wishes of the customer. If the extruded section has receivers in a grid pattern, the receivers which are not needed can be closed by means of a plug.
  • Extruded sections have the essential advantage that they can be produced relatively inexpensively, can have almost any arbitrary length, and can be integrated into all required flow conduits.
  • the extruded section can be used as a holder for further components, for flow control valves or check valves, sensors, monitoring elements and the like.
  • a considerable advantage of the present invention is considered to be that for one, no hose assemblies for supplying the ejectors with compressed air are needed, and that the electric lines for actuating the electric components can be housed in the sectional support, so that neither the electric lines nor the hose assemblies have an interfering effect. It is considered to be a further advantage that such sectional supports have a simple structure, but still show great rigidity, or respectively are very sturdy.
  • the sectional support has at least one conduit, in particular a compressed air conduit.
  • This compressed air conduit can be pneumatically connected via a connecting conduit having a check valve with a work conduit, which is connected with the propellant nozzle. It is possible in this way by opening the check valve to supply the work conduit with compressed air, by means of which the desired vacuum can be generated via the propellant nozzle. The check valve is closed when the desired vacuum has been reached, or if the propellant nozzle is not in use.
  • the sectional support has a blowoff conduit
  • the blowoff conduit is pneumatically connected with the exhaust air conduit by means of a check valve, in particular a slide. If this check valve is closed, the air present at the propellant nozzle is exhausted from the suction connector via the narrowed part, since it cannot escape via the exhaust air conduit. By blowing the compressed air out of the suction connector, the aspirated object can be released relatively quickly from the suction gripper, which is expressed by the technical term "blowing off".
  • sectional support can be divided by means of cut-off plugs for the conduits into discrete sections, which can be individually actuated. In this way it is possible to aspirate several objects and to manipulate them independently of each other by means of a single sectional support.
  • the individual propellant nozzles are connected via different check valves to a common compressed air conduit in this embodiment.
  • a further development provides that a sensor which detects a vacuum is provided which, as a function of the detected vacuum, connects the propellant nozzle with the compressed air conduit.
  • the vacuum prevailing in the suction gripper is detected by means of this sensor, and the connection to the compressed air conduit is interrupted, if the desired vacuum prevails in the suction gripper, i.e. if the object has been aspirated. Compressed air can be saved in this way. If the vacuum in the suction gripper drops, which can be the case when aspirating objects with uneven surfaces, or in case of damaged suction grippers, for example, the connection is automatically reestablished.
  • the sectional support is designed as a support beam for suction grippers connected with the suction connector.
  • the suction grippers are screwed into the support beam and therefore directly connected with the suction connector.
  • the sectional support is used as a suction cross bar, by means of which the objects to be grasped are directly aspirated and manipulated.
  • a muffling device in particular a foam material, is preferably provided in the exhaust air conduit.
  • This foam material for example in the shape of molded parts such as coils and the like, can be directly inserted into the exhaust air conduit, because of which the noise of the exhausted air is already muffled in the exhaust air conduit. Possibly no external muffler will be required at the outlet of the exhaust air conduit.
  • FIG. 1 is a lateral view of the sectional support of the present invention in accordance with a first embodiment with suction grippers provided thereon,
  • FIG. 2 is a section view along lines II--II in accordance with FIG. 1 through the sectional support, showing the propellant nozzle,
  • FIG. 3 is a section view along lines III--III in accordance with FIG. 1 through the sectional support, showing a check valve for a connecting conduit to the exhaust air conduit,
  • FIG. 4 is a lateral view of the sectional support in accordance with a second embodiment
  • FIG. 5 is a section view along lines V--V in accordance with FIG. 4 through the sectional support
  • FIG. 6 is a section view along lines VI--VI through the sectional support
  • FIG. 7 is a lateral view of the sectional support in accordance with a third embodiment
  • FIG. 8 is a section view along lines VIII--VIII through the sectional support in accordance with FIG. 7,
  • FIG. 9 is a section view along lines IX--IX through the sectional support in accordance with FIG. 7,
  • FIG. 10 is a lateral view of the sectional support in accordance with a fourth embodiment
  • FIG. 11 is a section view along lines XI--XI through the sectional support in accordance with FIG. 10, and
  • FIG. 12 is a section view along lines XII--XII through the sectional support in accordance with FIG. 10.
  • FIG. 1 represents a lateral view of a support beam 1, on whose underside a plurality of suction grippers 2 are fastened. As represented in FIG. 2, these suction grippers 2 have been screwed into appropriate receivers 3 of the support beam 1.
  • This support beam 1 has been produced in the form of an extruded section and has a compressed air conduit 4, a work conduit 5, a blowoff conduit 6, an exhaust air conduit 7, two conduits 8 and 9, as well as a stepped bore 10 extending orthogonally with respect to the conduits 4 to 9.
  • the stepped bore 10 intersects the conduits 5 to 9.
  • the stepped bore 10 is furthermore connected via a connecting conduit 11 with the suction connector 12 having the receiver 3.
  • a propellant nozzle 13 (propellant and receiver nozzle), which has a narrowed part 14 connected with the connecting conduit 11, is located in the stepped bore 10.
  • This propellant nozzle 13, as well as the stepped bore 10, together with the connecting conduit 11 constitute an ejector. If overpressure is applied to the work conduit 5, compressed air flows through the stepped bore 10 in the direction toward the conduit 9 and in the process flows through the propellant nozzle 13.
  • a vacuum in the connecting conduit 11 is generated in a known manner by the gas flowing through the propellant nozzle 13, so that air is aspirated via the suction grippers 2.
  • Each stepped bore 10 is closed off on its front face by means of a plug 15, which can be seen in FIG. 1. All stepped bores 10 terminate in the conduit 9 as well as in the work conduit 5. Plugs 16 can furthermore be seen in FIG. 1, which close off the front face of a further stepped bore 17. A piston 18 is displaceably arranged in this stepped bore 17, which can be pushed into the flow cross section of the conduit 9i. In FIG. 3, the piston 18 is in its position of rest, in which it is maintained by a pressure spring 19. The piston 18 is moved out of this position of rest when an overpressure is applied to the conduit 9, which moves the piston 18 in the direction toward the plug 16.
  • the pressure spring 19 is compressed by this and the piston 16 is pushed over the flow cross section of the conduit 9, so that the conduit 9 is blocked.
  • the piston 18 is pushed in front of the opening of an overflow conduit 20, so that the inflow opening to the exhaust air conduit 7 is closed.
  • the compressed air flowing through the propellant nozzle 13 can no longer escape, so that it is blown off via the suction connector 12 and the suction grippers 2.
  • Plugs 21 can also be seen in FIG. 1, by means of which the piston 18 is maintained in the associated step bore 17. With this embodiment it is possible to aspirate several objects together and to again deposit them together.
  • FIGS. 4-6 show a support beam 1 of a second embodiment, wherein the compressed air conduit 4 and the work conduit 5 are connected with each other via a connecting line 26, which is constituted by two conduit sections, which terminate at the surface 27 of the support beam 1.
  • the two conduit sections of the connecting line 26 are connected with each other via a check valve 28, which has been placed in the form of a module 29 on the surface 27 of the support beam 1.
  • this work conduit 5 is blocked by means of appropriate cut-off plugs, it is possible to divide the support beam 1 into discrete sections by combining several suction grippers 2.
  • FIG. 7 A lateral view of a third embodiment of the support beam 1 is represented in FIG. 7, wherein the work conduit 5 is connected via a connecting line 31, formed by two conduit sections which terminate at the surface 27 of the support beam 1, with the blow-off conduit 6, the same way as represented in FIG. 9.
  • the two conduit sections of the connecting line 31 are connected with each other via a check valve 32, through which the connection between the two conduits 5 and 6 can be made, or respectively interrupted.
  • the blowoff conduit 6 is furthermore divided into discrete sections by suitable cut-off plugs, so that it is possible to deposit the objects on the suction grippers located in these sections in a purposeful manner.
  • the check valve 32 is located in a module 33, wherein the modules are protected by a hood 30 in this embodiment, too.
  • the two conduits 4 and 5 are connected with each other via a connecting line 26, and the two conduits 5 and 6 via a connecting line 31.
  • the sectional support is divided into sections, the sections for aspirating and the sections for blowing-off can be of different sizes. Depending on the intended use, these sections can be arbitrarily combined.
  • the connecting conduit 11 is connected with a stepped bore 34.
  • a pressure sensor 35 has been installed in this stepped bore 34, by means of which the pressure in the suction connector 12, or respectively at the suction gripper 2, can be detected.
  • the check valve 28 is closed and the work circuit 5 is disconnected from the compressed air conduit 4 by this, so that no compressed air is used.
  • the check valve 28 is opened again and air is aspirated from the suction gripper 2 by means of the propellant nozzle 13.
  • This sensor 35 can also be provided in each section and with the other embodiments.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Manipulator (AREA)
US09/270,672 1998-03-20 1999-03-16 Ejector Expired - Fee Related US6155795A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19812275 1998-03-20
DE19812275A DE19812275B4 (de) 1998-03-20 1998-03-20 Transportvorrichtung

Publications (1)

Publication Number Publication Date
US6155795A true US6155795A (en) 2000-12-05

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US (1) US6155795A (sv)
DE (1) DE19812275B4 (sv)
SE (1) SE521828C2 (sv)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6394760B1 (en) * 1998-03-20 2002-05-28 Piab Ab Vacuum ejector pump
EP1327593A1 (en) * 2002-01-10 2003-07-16 Agfa Corporation Apparatus and method for picking printing plates of various sizes
US20060131905A1 (en) * 2004-12-20 2006-06-22 Giacobbe Mazzucchelli Negative-pressure valve device to be used in general purpose gripping panel devices
US20100025905A1 (en) * 2008-07-30 2010-02-04 J. Schmalz Gmbh Pneumatically actuated area vacuum gripper
CN101037162B (zh) * 2006-03-15 2011-07-27 J.施马尔茨有限公司 真空面抓取装置
CN102431787A (zh) * 2011-11-28 2012-05-02 四川长虹电器股份有限公司 清除真空吸盘杂物的方法
US10823223B2 (en) 2015-03-03 2020-11-03 Delaware Capital Formation, Inc. Override for an automatic release vacuum device
US11103824B2 (en) 2016-09-01 2021-08-31 Vtec Co., Ltd. Vacuum pump and array thereof
US20220234217A1 (en) * 2019-05-31 2022-07-28 Fuji Corporation Nozzle replacement table unit

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20011839U1 (de) 2000-07-07 2000-12-14 Festo AG & Co, 73734 Esslingen Vakuumerzeugervorrichtung
DE102005020591C5 (de) * 2005-05-03 2009-11-05 Rolf Pitzen Basisvorrichtung einer Anlage zur Weiterverarbeitung von Druckerzeugnissen
DE202006005312U1 (de) * 2006-01-10 2006-06-01 Wohlenberg Buchbindesysteme Gmbh Vorrichtung zum Abkippen eines Teils einer zu vereinzelnden Signatur von einem Stapel
DE102010060517A1 (de) * 2010-11-12 2012-05-16 Schott Solar Ag Verfahren und Anordnung zum Handhaben eines Gegenstandes
DE102011080463A1 (de) * 2011-08-04 2013-02-07 Deutsches Institut Für Lebensmitteltechnik E.V. Vorrichtung und Verfahren zum Herstellen gefüllter Lebensmittel
DE102023102823A1 (de) * 2023-02-06 2024-08-08 Thielen Automation Gmbh Verfahren zur Durchführung eines Greifvorgangs für ein Wäscheteil

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716307A (en) * 1971-10-06 1973-02-13 Kms Ind Inc Venturi head for vacuum systems
US3967849A (en) * 1973-06-14 1976-07-06 Sahlin International, Inc. Vacuum control system
DE2429421C2 (de) * 1974-06-19 1981-12-10 Vits-Maschinenbau Gmbh, 4018 Langenfeld Vorrichtung zum Anheben des oberen Bogens eines Stapels mit Blasluft
US4432701A (en) * 1981-04-07 1984-02-21 Yoji Ise Vacuum controlling device
DE2457316C2 (de) * 1973-12-05 1986-07-24 Aktiebolaget Piab, Åkersberga Ejektorvorrichtung
US5205717A (en) * 1991-10-31 1993-04-27 Piab Ab Ejector array and a method of achieving it
DE4302951C1 (de) * 1993-02-03 1994-05-05 Schmalz J Gmbh Strahlpumpe
DE19522741A1 (de) * 1995-06-22 1997-01-02 Kodak Ag Verfahren und Vorrichtung zum Abnehmen eines Blattes von einem Stapel
DE3818380C2 (de) * 1987-05-30 1997-09-11 Myotoku Kk Strahlpumpenanordnung
DE19609826A1 (de) * 1995-03-03 1997-09-18 Siempelkamp Handling Sys Gmbh Verfahren für das Abstapeln von Holzwerkstoffplatten
US5683227A (en) * 1993-03-31 1997-11-04 Smc Corporation Multistage ejector assembly
US6024392A (en) * 1996-01-23 2000-02-15 Isi Norgren, Inc. Vacuum cup actuator

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1973433U (de) * 1966-06-25 1967-11-30 Ima Klessmann K G Vereinzelungsvorrichtung fuer steifen aus holzfurnier, kunststoff-folien u. dgl.

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716307A (en) * 1971-10-06 1973-02-13 Kms Ind Inc Venturi head for vacuum systems
US3967849A (en) * 1973-06-14 1976-07-06 Sahlin International, Inc. Vacuum control system
DE2457316C2 (de) * 1973-12-05 1986-07-24 Aktiebolaget Piab, Åkersberga Ejektorvorrichtung
DE2429421C2 (de) * 1974-06-19 1981-12-10 Vits-Maschinenbau Gmbh, 4018 Langenfeld Vorrichtung zum Anheben des oberen Bogens eines Stapels mit Blasluft
US4432701A (en) * 1981-04-07 1984-02-21 Yoji Ise Vacuum controlling device
DE3818380C2 (de) * 1987-05-30 1997-09-11 Myotoku Kk Strahlpumpenanordnung
US5205717A (en) * 1991-10-31 1993-04-27 Piab Ab Ejector array and a method of achieving it
DE4302951C1 (de) * 1993-02-03 1994-05-05 Schmalz J Gmbh Strahlpumpe
US5683227A (en) * 1993-03-31 1997-11-04 Smc Corporation Multistage ejector assembly
DE19609826A1 (de) * 1995-03-03 1997-09-18 Siempelkamp Handling Sys Gmbh Verfahren für das Abstapeln von Holzwerkstoffplatten
DE19522741A1 (de) * 1995-06-22 1997-01-02 Kodak Ag Verfahren und Vorrichtung zum Abnehmen eines Blattes von einem Stapel
US6024392A (en) * 1996-01-23 2000-02-15 Isi Norgren, Inc. Vacuum cup actuator

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Patent Abstract of Japan, M 1300, Aug. 24, 1992, vol. 16/No. 399, Ejector Device 4 132900. *
Patent Abstract of Japan, M-1300, Aug. 24, 1992, vol. 16/No. 399, Ejector Device 4-132900.

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6394760B1 (en) * 1998-03-20 2002-05-28 Piab Ab Vacuum ejector pump
EP1327593A1 (en) * 2002-01-10 2003-07-16 Agfa Corporation Apparatus and method for picking printing plates of various sizes
US20060131905A1 (en) * 2004-12-20 2006-06-22 Giacobbe Mazzucchelli Negative-pressure valve device to be used in general purpose gripping panel devices
CN101037162B (zh) * 2006-03-15 2011-07-27 J.施马尔茨有限公司 真空面抓取装置
US20100025905A1 (en) * 2008-07-30 2010-02-04 J. Schmalz Gmbh Pneumatically actuated area vacuum gripper
US8267386B2 (en) * 2008-07-30 2012-09-18 J. Schmalz Gmbh Pneumatically actuated area vacuum gripper
CN102431787A (zh) * 2011-11-28 2012-05-02 四川长虹电器股份有限公司 清除真空吸盘杂物的方法
US10823223B2 (en) 2015-03-03 2020-11-03 Delaware Capital Formation, Inc. Override for an automatic release vacuum device
US11103824B2 (en) 2016-09-01 2021-08-31 Vtec Co., Ltd. Vacuum pump and array thereof
US20220234217A1 (en) * 2019-05-31 2022-07-28 Fuji Corporation Nozzle replacement table unit

Also Published As

Publication number Publication date
SE9900981L (sv) 1999-09-21
DE19812275A1 (de) 1999-09-30
SE9900981D0 (sv) 1999-03-18
DE19812275B4 (de) 2004-03-11
SE521828C2 (sv) 2003-12-09

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